Number of ternary words of length n (beginning 0) with autocorrelation function 2^(n-1)+3.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =2a(5) =8a(6) =24a(7) =70a(8) =214a(9) =638a(10) =1930a(11) =5782a(12) =17394a(13) =52160a(14) =156620a(15) =469786a(16) =1409786a(17) =4229148a(18) =12688720a(19) =38065506a(20) =114200378a(21) =342599212a(22) =1027809200a(23) =3083421770a(24) =9250300098a(25) =27750882922a(26) =83252753086a(27) =249758206958a(28) =749274934114